cylinders B and c, which is conveyed thence to a storage receiver
for distribution by main to the various motors.
When work is done on a gas, the temperature is raised, by
reason of the conversion of that work into heat; and again, when
9, gas does work its temperature is lowered, for a reverse reason.
The changes are shewn in Fig. 562, Draw co-ordinates o F for
pressure and o J for volumes; then let the piston commence with
a ^cylinder volume i, opposite A, and atmospheric pressure 15 Ibs.
at i A, the temperature being 60° F. A c is a hyperbola or
isothermal (' at constant temperatureJ) of 60°, while E B and D K